Demon Slayer? Demon Pillar?

(When traveling through the "system", there will sometimes be some linkages, and some unexpected things will happen. No harem, single-mindedness. It won't be too tough in the early and middle stages, but it will be a bit tough in the later stages.) Jiang An is a very ordinary male college student who likes to watch Demon Slayer anime. He feels that the plot is too harsh, so he often fantasizes about traveling into the anime to change the plot. On this day, he really traveled into the world of Demon Slayer: Kimetsu no Yaiba, and obtained a "system". With the help of the "system", he created the Demonic Breath. What kind of adventure will Jiang An have in this world? The plot will be connected to the main plot of the anime, but the actions of the male protagonist will definitely change the plot.